Denethor II:

The Steward Denethor II was the last of the Ruling Stewards of Gondor. He ruled Gondor in the years of the War of the Ring, though he did not live to see victory. Denethor was born in the year 2395 of the Third Age of the Sun. After the death of his wife, Finduilas, it is believed that Denethor started to use the Palantir of Minas Anor. It was through this that he gained news of Sauron's strength, though it also destroyed his mind with despair. Denethor burned himself alive in the madness of despair.